Lexmark C950 - Lower Engine PCBA Fuse 12 Blown; Lower Engine PCBA Fuse 13 Blown; Upper Engine PCBA Data Failure

Diagnostic information 2-79
5058-030
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191.16 Lower engine PCBA fuse 12 blown
191.17 Lower engine PCBA fuse 13 blown
191.18 Upper engine PCBA data failure
Step Action and questions Yes No
1 Warning: Remove the cause of
blown fuse before replacing the
lower engine PCBA.
Check the following parts circuits
for overcurrent and overvoltage:
• PC/Developer drive motor
• Fuser motor assembly
Are the current and voltage
values normal?
Go to step 2. Replace the faulty parts, or repair
the circuits.
2
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-98.
Problem resolved
Step Action and questions Yes No
1 Warning: Remove the cause of
blown fuse before replacing the
lower engine PCBA.
Check the PC/Developer drive
motor (Y,M,C) circuits for
overcurrent and overvoltage:
Are the current and voltage
values normal?
Go to step 2. Replace the faulty parts, or repair
the circuits.
2
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-98.
Problem resolved
Step Action and questions Yes No
1 POR The machine.
Does the error continue?
Go to step 2 Problem resolved
2 Install the correct version of the
firmware.
Does the problem persist?
Turn the power OFF, and replace
the upper printer engine PCBA.
Go to
“Upper printer engine
PCBA removal” on page 4-181.
Problem resolved